SLI memory amount question

daniele1234 · Apr 3, 2014

Hi

Basically, if i put for instance two gtx 780 ti (s) in sli would i have 6gb of available memory because of 3gb + 3gb or would i only have 3gb of available memory? Also if i was to have only 3gb of memory for both cards would that be enough for decent frame rates at 4k?

Thanks

spp85 · Apr 3, 2014

unfortunately only 3GB usable in your case. 3GB seems a bit tight for 4k. But I am sure its sufficient for 2 years or so.

daniele1234 · Apr 3, 2014

why only 3gb but for instance the titan z has 12gb, which is also sli?

spp85 · Apr 3, 2014

Titan Z is a duel GPU card even though they state as 12 GB, internally 12 GB is split into 6GB each for the 2 GPUs on the card. SLI and Crossfire results half memory as effectively usable. If it sates 12 GB 6GB is whats available. I think you may wait a little bit for the Titan Z and Radeon R9 295X2 to launch.

daniele1234 · Apr 3, 2014

so the r9 295 x2 (r9 290x crossfire) will only have 4gb of memory instead of 8gb of memory?

Eduello · Apr 3, 2014

Yes, all the data in the memory is mirrored between the cards so you won't have more memory even though you add more GPUs.

coolcole01 · Apr 3, 2014

Yep vram doesnt stack

daniele1234 · Apr 3, 2014

so why does the gtx 780 ti sli always come out on top at 4k if it only has 3gb of gram?

daniele1234 · Apr 3, 2014

Eduello · Apr 3, 2014

Because 4k doesn't really use that much memory (most of the time anyway). If there's not enough memory, fps will drop to somewhere around 5, it's not going to smoothly get lower and lower, it just drops the instant you run out of memory.

daniele1234 · Apr 3, 2014

so gtx 780 ti sli with 3gb of usable memory would be good enough for 4k.

Billy Pilgrim · Apr 3, 2014

This might help you get an idea of 780 ti performance in 4K: http://www.guru3d.com/articles_pages/gtx_780_ti_sli_geforce_review,23.html

daniele1234 · Apr 3, 2014

if i put 2 of the upcoming r9 290x sapphire vapour x 8gb versions and put them in sli would they together have 8gb or 16gb of memory. Also would that be better that two gtx 780 tis in sli at 4k?

daniele1234 · Apr 3, 2014

Also does a dual gpu, like the upcoming r9 295 x2, work in the same area as only having 4gb of memory or would it have 8gb of memory since it is a dual gpu card?

coolcole01 · Apr 3, 2014

Two 8 gb cards combined would have 8 gb of effective vram. The 295 x 4 gb version will have 8 total but 4 effective for use. To beat two 780 ti sli you would need one titan z or two titan blacks or three 290x cards.

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SLI memory amount question

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